package filter;

import java.io.IOException;
import javax.servlet.Filter;
import javax.servlet.FilterChain;
import javax.servlet.FilterConfig;
import javax.servlet.ServletException;
import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;
import javax.servlet.annotation.WebFilter;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;

/**
 * Servlet Filter implementation class filter
 */
@WebFilter("*.jsp")
public class filter implements Filter {

    /**
     * Default constructor. 
     */
    public filter() {
        // TODO Auto-generated constructor stub
    }

	/**
	 * @see Filter#destroy()
	 */
	public void destroy() {
		// TODO Auto-generated method stub
	}

	/**
	 * @see Filter#doFilter(ServletRequest, ServletResponse, FilterChain)
	 */
	public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain) throws IOException, ServletException {
		// TODO Auto-generated method stub
		// place your code here

		// pass the request along the filter chain
		   HttpServletRequest req = (HttpServletRequest) request;
	       HttpSession session = req.getSession();
	       Boolean flag = (Boolean) session.getAttribute("loginFlag");
	       boolean loginFlag;
	        if (flag == null) {
	            loginFlag = false;
	        } else {
	            loginFlag = flag;
	        }
	        if (!loginFlag) {
	       HttpServletResponse res = (HttpServletResponse) response; 
	 	   res.sendError(HttpServletResponse.SC_UNAUTHORIZED); return;
	       //((HttpServletResponse) response).sendRedirect("index.html");return;
	}
		chain.doFilter(request, response);
	}

	/**
	 * @see Filter#init(FilterConfig)
	 */
	public void init(FilterConfig fConfig) throws ServletException {
		// TODO Auto-generated method stub
	}

}
